151 lines
4.3 KiB
Ruby
151 lines
4.3 KiB
Ruby
# frozen_string_literal: true
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class ResolveAccountService < BaseService
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include JsonLdHelper
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include DomainControlHelper
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include WebfingerHelper
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# Find or create an account record for a remote user. When creating,
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# look up the user's webfinger and fetch ActivityPub data
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# @param [String, Account] uri URI in the username@domain format or account record
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# @param [Hash] options
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# @option options [Boolean] :redirected Do not follow further Webfinger redirects
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# @option options [Boolean] :skip_webfinger Do not attempt to refresh account data
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# @return [Account]
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def call(uri, options = {})
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return if uri.blank?
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process_options!(uri, options)
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# First of all we want to check if we've got the account
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# record with the URI already, and if so, we can exit early
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return if domain_not_allowed?(@domain)
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@account ||= Account.find_remote(@username, @domain)
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return @account if @account&.local? || @domain.nil? || !webfinger_update_due?
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# At this point we are in need of a Webfinger query, which may
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# yield us a different username/domain through a redirect
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process_webfinger!(@uri)
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@domain = nil if TagManager.instance.local_domain?(@domain)
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# Because the username/domain pair may be different than what
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# we already checked, we need to check if we've already got
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# the record with that URI, again
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return if domain_not_allowed?(@domain)
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@account ||= Account.find_remote(@username, @domain)
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if gone_from_origin? && not_yet_deleted?
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queue_deletion!
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return
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end
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return @account if @account&.local? || gone_from_origin? || !webfinger_update_due?
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# Now it is certain, it is definitely a remote account, and it
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# either needs to be created, or updated from fresh data
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fetch_account!
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rescue Webfinger::Error, Oj::ParseError => e
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Rails.logger.debug "Webfinger query for #{@uri} failed: #{e}"
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nil
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end
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private
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def process_options!(uri, options)
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@options = options
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if uri.is_a?(Account)
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@account = uri
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@username = @account.username
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@domain = @account.domain
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else
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@username, @domain = uri.split('@')
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end
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@domain = begin
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if TagManager.instance.local_domain?(@domain)
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nil
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else
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TagManager.instance.normalize_domain(@domain)
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end
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end
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@uri = [@username, @domain].compact.join('@')
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end
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def process_webfinger!(uri)
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@webfinger = webfinger!("acct:#{uri}")
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confirmed_username, confirmed_domain = split_acct(@webfinger.subject)
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if confirmed_username.casecmp(@username).zero? && confirmed_domain.casecmp(@domain).zero?
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@username = confirmed_username
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@domain = confirmed_domain
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return
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end
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# Account doesn't match, so it may have been redirected
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@webfinger = webfinger!("acct:#{confirmed_username}@#{confirmed_domain}")
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@username, @domain = split_acct(@webfinger.subject)
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unless confirmed_username.casecmp(@username).zero? && confirmed_domain.casecmp(@domain).zero?
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raise Webfinger::RedirectError, "The URI #{uri} tries to hijack #{@username}@#{@domain}"
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end
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rescue Webfinger::GoneError
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@gone = true
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end
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def split_acct(acct)
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acct.gsub(/\Aacct:/, '').split('@')
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end
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def fetch_account!
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return unless activitypub_ready?
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RedisLock.acquire(lock_options) do |lock|
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if lock.acquired?
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@account = ActivityPub::FetchRemoteAccountService.new.call(actor_url)
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else
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raise Mastodon::RaceConditionError
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end
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end
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@account
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end
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def webfinger_update_due?
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return false if @options[:check_delivery_availability] && !DeliveryFailureTracker.available?(@domain)
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@account.nil? || ((!@options[:skip_webfinger] || @account.ostatus?) && @account.possibly_stale?)
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end
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def activitypub_ready?
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['application/activity+json', 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"'].include?(@webfinger.link('self', 'type'))
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end
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def actor_url
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@actor_url ||= @webfinger.link('self', 'href')
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end
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def gone_from_origin?
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@gone
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end
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def not_yet_deleted?
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@account.present? && !@account.local?
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end
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def queue_deletion!
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AccountDeletionWorker.perform_async(@account.id, reserve_username: false, skip_activitypub: true)
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end
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def lock_options
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{ redis: Redis.current, key: "resolve:#{@username}@#{@domain}" }
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end
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end
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